=head1 NAME
SDL::GFX::Framerate - framerate calculating functions
=head1 CATEGORY
GFX
=head1 DESCRIPTION
The framerate functions are used to insert delays into the graphics loop to maintain a constant framerate.
=head1 METHODS
=head2 init
use SDL;
use SDL::GFX::Framerate;
use SDL::GFX::FPSManager;
my $fps = SDL::GFX::FPSManager->new(0, 0, 0, 0);
SDL::GFX::Framerate::init($fps);
Initialize the framerate manager, set default framerate of 30Hz and reset delay interpolation.
=head2 set
SDL::GFX::Framerate::set($fps, 60);
Sets the new desired framerate to 60 frames per second.
=head2 get
my $rate = SDL::GFX::Framerate::get($fps);
Get the currently set framerate of the manager.
=head2 delay
SDL::GFX::Framerate::delay($fps);
Generate a delay to accomodate currently set framerate. Call once in thegraphics/rendering loop.
If the computer cannot keep up with the rate (i.e.drawing too slow), the delay is zero and the delay interpolation is reset.